package cn.tedu.jdbc;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Scanner;

/**
 * @Author Justin Parker
 * @Date 2024/7/30 0030 14:09
 * @Version 1.0
 */
/*
    JDBC执行DML语句：UPDATE、INSERT、DELETE
    修改密码功能;
    输入用户名：Tony
    输入新密码:654321
    结果：修改成功 | 该用户不存在，修改失败
 */
public class JDBCDemo02 {
    public static void main(String[] args) throws ClassNotFoundException, SQLException {
        /*
            1.加载驱动：Class.forName("");
            2.创建连接对象：Connection conn = DriverManager.getConnection("","root","123456");
            3.执行对象：conn.createStatement();
            4.执行sql：statement.executeUpdate("");
            5.断开连接：connection.close();
         */
        Class.forName("com.mysql.cj.jdbc.Driver");
        Connection connection = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/tedu?characterEncoding=utf8&useSSL=false&serverTimezone=Asia/Shanghai&rewriteBatchedStatements=true",
                "root",
                "root");
        Statement statement = connection.createStatement();
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入用户名：");
        String username = scanner.nextLine();
        System.out.println("请输入新密码：");
        String password = scanner.nextLine();

        String sql = "update userinfo set password ='"+password+"' where username ='"+username+"'";

        int i =statement.executeUpdate(sql);
        if (i>0){
            System.out.println("修改成功");
        }else {
            System.out.println("该用户不存在，修改失败");
        }
        statement.close();
        }
    }

